The Moon is composed of two major geologic provinces that have a unique origin, composition, and thermal evolution. The Procellarum KREEP Terrane is a small province on the near side of the Moon that has high abundances of KREEP. The felspathic highlands terrane, in contrast is composed predominantly of ancient anorthositic materials. A third terrane, the South Pole-Aitken Terrane, may simply represent deep crustal materials of the feldspathic highlands terrane. KREEP stands for potassium (atomic symbol K), rare earth elements (REE), and phosphorus (P). ...
References
Bradley. Jolliff, Jeffrey Gillis, Larry Haskin, Randy Korotev, and Mark Wieczorek (2000). "Major lunar crustal terranes". J. Geophys. Res.: 4197-4216.
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